GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1997 🢒 Corvette 🢒 Restraints 🢒 SIR 🢒 AIR BAG Warning Lamp Does Not Come On

Object Number: 69588 Size: MF
SIR Components
Supplemental Inflatable Restraint Schematics
SIR Caution
SIR Caution
SIR Caution
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The ignition switch supplies Ignition 1 voltage to the inflatable restraint Sensing and Diagnostic Module (SDM) at terminal 10 using the SDM Fuse. The ignition switch also supplies Ignition 1 voltage to the AIR BAG warning lamp using the IPC Fuse. The AIR BAG warning lamp is connected to the INFLATABLE RESTRAINT INDICATOR at terminal 7 of the SDM. When the ignition switch is first turned to ON, the SDM responds by flashing the AIR BAG warning lamp seven times.

When measurements are requested in this table, use J 39200 Digital Multimeter with the correct terminal adapter from J 35616 Connector Test Adapter Kit. When a check for proper connection is requested, refer to General Electrical Diagnosis Procedures in Wiring Systems. When a wire, connector or terminal repair is requested, use J-38125 Terminal Repair Kit and refer to Wiring Repair .

Test Description

The numbers below refer to the step numbers on the diagnostic table:

  1. This test determines whether the malfunction is in the inflatable restraint Sensing and Diagnostic Module (SDM) circuitry or in the instrument cluster power feed circuitry.

    2.

  2. This test determines whether voltage is present in the warning lamp circuit.

    3.

  3. This test isolates CKT 358 and checks for a short in CKT 358 to B+.

    4.

  4. This test determines if the malfunction is in the instrument cluster connector.

    5.

  5. This test determines if the open is due to a bad bulb.

    6.

  6. This test isolates an open in the warning lamp circuitry.

    7.

  7. This test checks whether power is available to the instrument cluster power feed circuit.

    8.

  8. This test checks for a short from the instrument cluster power feed circuit to ground.

    9.

  9. This test determines whether the short to ground is due to a short in the wiring or internal to the instrument cluster.

    10.

  10. This test determines if the malfunction is in the instrument cluster connector.

    11.

  11. This test determines whether the malfunction is due to an open power feed circuit from the IPC Fuse.

Air Bag Warning Lamp Does Not Come On

Step

Action

Value(s)

Yes

No

1

Was the SIR Diagnostic System Check performed?

--

Go to Step 2

Go to SIR Diagnostic System Check

2
  1. Set the parking brake.
  2. Turn the ignition switch to ON.

Does the BRAKE indicator light?

--

Go to Step 3

Go to Step 13

3
  1. Turn the ignition switch OFF.
  2. Disconnect the inflatable restraint steering wheel and I/P module yellow 2-way connectors at the base of the steering column.
  3. Disconnect the inflatable restraint Sensing and Diagnostic Module (SDM).
  4. Install J 38715-96 SIR Shorting Bar Tool to the SDM harness connector.
  5. Install the CPA.
  6. Turn the ignition switch to ON.
  7. Measure the voltage on the SDM harness connector from terminal 7 to ground.

Is the voltage more than the specified value?

10.0 V

Go to Step 4

Go to Step 6

4
  1. Turn the ignition switch OFF.
  2. Disconnect the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  3. Turn the ignition switch to ON.
  4. Measure the voltage on the SDM harness connector from terminal 7 to ground.

Is the voltage less than the specified value?

1.0 V

Go to Integrity Check

Go to Step 5

5
  1. Turn the ignition switch OFF.
  2. Repair a short-to-B+ condition in CKT 358.
  3. Reconnect the instrument cluster.

Are the repairs complete?

--

Go to Step 24

--

6
  1. Turn the ignition switch OFF.
  2. Remove the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  3. Check for proper connection to the instrument cluster at terminal B12.

Is the connector damaged or corroded?

--

Go to Step 7

Go to Step 8

7

Repair the instrument cluster harness connector. Refer to Connector Repairs in Wiring Systems.

Are the repairs complete?

--

Go to Step 24

--

8
  1. Remove the AIR BAG warning lamp bulb. Refer to Instrument Cluster Indicator Lamp Replacement in Instrument Panel, Gauges and Console.
  2. Inspect the bulb.

Is the bulb good?

--

Go to Step 10

Go to Step 9

9
  1. Replace the AIR BAG warning lamp bulb.
  2. Install the instrument cluster.

Are the repairs complete?

--

Go to Step 24

--

10
  1. Install the AIR BAG warning lamp bulb.
  2. Measure the resistance from the instrument cluster harness connector terminal B12 to the SDM harness connector terminal 7.

Is the resistance within the specified values?

0-5 ohms

Go to Step 12

Go to Step 11

11
  1. Repair an open condition in CKT 358.
  2. Install the instrument cluster.

Are the repairs complete?

--

Go to Step 24

--

12

Service the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Are the repairs complete?

--

Go to Step 24

--

13
  1. Turn the ignition switch OFF.
  2. Remove the IPC Fuse.
  3. Inspect the fuse.

Is the fuse good?

--

Go to Step 19

Go to Step 14

14
  1. Replace the fuse.
  2. Turn the ignition switch to ON for 10 seconds.
  3. Turn the ignition switch OFF.
  4. Remove the IPC Fuse.
  5. Inspect the fuse.

Is the fuse good?

--

Go to Step 18

Go to Step 15

15
  1. Disconnect the inflatable restraint steering wheel and I/P module yellow 2-way connectors at the base of the steering wheel.
  2. Disconnect the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  3. Replace the IPC Fuse.
  4. Turn the ignition switch to ON for 10 seconds.
  5. Turn the ignition switch OFF.
  6. Remove the IPC Fuse.
  7. Inspect the fuse.

Is the fuse good?

--

Go to Step 17

Go to Step 16

16
  1. Repair a short-to-ground condition in CKT 139.
  2. Replace the IPC Fuse.

Are the repairs complete?

--

Go to Step 24

--

17
  1. Service the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  2. Install the IPC Fuse.

Are the repairs complete?

--

Go to Step 24

--

18

Install the IPC Fuse.

Are the repairs complete?

--

Go to Step 24

--

19
  1. Remove the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  2. Check for proper connection to the instrument cluster at terminal A13.

Is the connector damaged or corroded?

--

Go to Step 20

Go to Step 21

20

Repair the instrument cluster harness connector. Refer to Connector Repairs in Wiring Systems.

Are the repairs complete?

--

Go to Step 24

--

21

Measure the resistance between the instrument cluster harness connector terminal A13 to each terminal of the IPC Fuse fuseholder.

Is either reading within the specified values?

0-5 ohms

Go to Step 23

Go to Step 22

22
  1. Repair an open condition in CKT 139.
  2. Install the IPC Fuse.

Are the repairs complete?

--

Go to Step 24

--

23
  1. Repair an open condition in the power feed to the IPC Fuse.
  2. Install the IPC Fuse.

Are the repairs complete?

--

Go to Step 24

--

24

Reconnect all the SIR system components, make sure all the components are properly mounted.

Have all the SIR components been reconnected and properly mounted?

--

Go to SIR Diagnostic System Check

--